JPS6142345A - Fine pulverizer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION a. Field of Industrial Application The present invention provides a high-speed rotary induction lees crushing machine for efficiently crushing materials to be crushed.

b. Conventional technology and problems Many of the high-speed rotating impact crushers represented by names such as pin mills and hammer mills have a large crushing ratio (original T1 particle size/crushed product particle size), and are more difficult than ball mills and vibration mills. The grinding time ('a) is widely used as a continuous grinder because the residence time is extremely short and the operation is simple.

However, the particle size of the pulverized product obtained by this type of pulverizer is generally on the order of several hundred II for the following reasons, and its distribution is also extremely wide.

■ The crusher groove is one-pass continuous type, and the crushing is done by instantaneous impact (tri-blow) (volume crushing), and some of the objects to be crushed are subjected to sufficient impact, while others are not.

■ Even when a screen (punched perforated plate) is installed to control particle size, the minimum screen size is about 200μ due to manufacturing issues.

■ When the object to be crushed becomes fine particles, 1) the probability that the object to be crushed will collide with the striking pillar decreases, and it will no longer be affected by the crushing effect of the collision.

In addition, in the past, a classifier was often used in addition to the crusher system, but the resulting crushed products were on the order of several tens of microns, whereas conventional high-speed rotary impact crushers could produce Q1-digit micron or submicron products. It is difficult to obtain fine powder.

Means for solving the C9 problem The present invention covers the drawbacks of the one-bath pulverization in the prior art, and also lowers the particle size reached by pulverization, from one digit micron to
We provide a high-speed rotary impact crusher that can stably obtain submicron fine powder.The gist is that a centrifugal classifier is installed adjacent to the impact crusher, and a There is provided a pulverizer, characterized in that a coarse powder pulverizer (1) provided therein is connected to a material supply port of the pulverizer (1) above through a circulation pipe.

d. Example The present invention will be described in detail below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a crusher casing, which consists of a crusher side casing 1) having a supply port 2 for crushed material and a classifier side casing l having a discharge port 3.

Casing 1. A crushing chamber 4 is formed within the casing 1), and a classification chamber 5 is formed within the casing 1).

Casing 1. There is a circulation pipe 6 in the area facing the classification chamber 5.
The other end of the pipe line 6 is connected to the supply port 2 for the material to be crushed.

The crushing chamber 4 and classification chamber 5 can be tightened by removing the tool 7 from the casing 1) and 1. By moving the classification chamber side in parallel with the motor using a slide rail (not shown), each chamber can be opened 4.5 degrees and maintenance can be performed easily.

In addition, a product collector such as a bag filter 8 is installed at the discharge port 3.
and a suction blower 9 are connected as accessory equipment.

Inside the crushing chamber 4, there is a rotating disk 1) that rotates at high speed around a rotating shaft 10, and a large number of impact columns 12 are installed on the outer peripheral surface of the rotating disk Ill.

On the other hand, Seeding 1. A large number of impact pillars 13 are installed on the inner periphery of the impact pillar 12 so as to intersect with and face each other.

Inside the classification chamber 5, there is a classification blade 15 that rotates at high speed around a rotating shaft 14. 16 is a motor for rotating the classification blade 15. Although the classification blade 15 and the rotation i1) are located on the same axis, the rotating shafts are not connected and each can rotate independently at high speed (eg, outer peripheral speed max. 150 m/s).

The classification blades 15 are blades 1 arranged radially at equal angles.
The outer side of the blade 17 faces the casing 12, and the inner side communicates with the discharge port 3 through an opening 19. 20 is a passage between the crushing chamber 4 and the classification chamber 5, which is formed by the partition plate 21 and the disk 18.

22 and 23 are auxiliary vanes, 24 is a secondary air inlet, and 25 is a foreign matter removal valve provided in the middle of the circulation passage 6.

The foreign matter removal valve 25 is an on-off valve body 27 built in a discharge pipe 26 branched from the circulation passage 6, as shown in FIG. It consists of a valve seat 28 and a fluid cylinder 29 for actuating it.

As another example, as shown in FIGS. 5 and 6, an impact plate 30 is used instead of the impact pillar 12, and the impact pillar I
3, an uneven surface 31 can be used.

80 Operation First, the rotary disk 1) and the classification blade 17 are separately rotated in the same direction, and the suction blower 9 is operated.

Next, the material to be crushed (hereinafter referred to as material) is introduced through the raw material supply port 2. The input material enters the crushing chamber 4 from the inlet 2, receives centrifugal force from the action of the rotary disk 1), especially the auxiliary blades 22, moves to the outer periphery of the rotary disk 1), and here the impact column 1
2.13, it is crushed.

The crushed material enters the classification chamber 5 through the passage 20.

Here, it is subjected to a classification action by the rotating classification blade 17.

In this state, air flows from the circulation pipe 6 toward the supply port 2 due to the pressure difference between the airflow caused by the rotation of the rotary disk 1) and the classification blade 17, and also the suction of the blower 9. As a result of this action, a flow is generated in the classification chamber 5 from the intake 5 through the opening 19 and from the outlet 3 toward the bag filter 8.

In the crusher of the present invention, the place receiving the crushing action is the outer periphery of the rotary disk rotating at high speed, where the centrifugal force is greatest, and the rotary disk 1) and the housing 1. Since the spacing between the two is narrow, the object to be crushed can easily receive a large and uniform centrifugal force, and the particle size can be easily uniform. Because there are a large number of impact columns in the narrowly spaced crushing chamber, the probability of collision of the object to be crushed with the impact columns is significantly increased, and compared to conventional impact crushers, the resulting particle size is several orders of magnitude smaller, resulting in a finer powder. is obtained.

The pulverized material is then classified by a centrifugal classification mechanism having classification blades 5 that rotate independently without a rotary disk mounted inside the machine.

The classification cut point is determined by the balance between the centrifugal force generated by the rotation of the classification blades that the particles receive and the suction force caused by the air volume sucked by the blower.

The fine powder that is classified and has a large suction force becomes a product and passes through the outlet 3 and is collected by the bag filter 8, while the coarse powder that has a large centrifugal force passes through the classification section pipe 6 and is sent to the supply port 2 by a self-circulation line. It is returned to the supply port and subjected to the same crushing action as described above.

When the material to be crushed is a natural product, there may be a small amount of foreign matter (
Coarse powder) is often mixed. If this is left as is, the inside of the pulverizer will eventually become full of foreign matter (coarse powder), reducing the pulverizing efficiency and eventually overloading the motor.

Therefore, when the cylinder 29 is activated to open the valve 27 against the valve seat 28 at a suitable time, the pressure inside the pipeline is maintained higher than atmospheric pressure during operation, so foreign substances circulating in the pipeline can be contained. The material is discharged through the discharge pipe 26.

f. Effects As described above, according to the pulverizer according to the present invention, classification and re-pulverization can be performed continuously within the pulverizer, so that the drawbacks of the conventional one-bath pulverization can be compensated for. and grinding chamber 4
Since the classification chamber 5 is provided immediately after and adjacent to the classification chamber 5, the classification operation can be performed while preventing the agglomeration peculiar to fine particles, resulting in a good classification effect. In addition, without sacrificing the advantages of conventional high-speed rotary impact crushers such as short crushing time and ease of operation, fine powder (-digit micron to (submicron) can be obtained efficiently and stably.

In addition, in this type of crushing method, the air inside the machine is rotated at high speed, which often generates heat, which may create adverse conditions for the material to be crushed. However, in the crusher of the present invention, the outer wall of the casing is It is also possible to use a jacket structure and water cooling.

In addition, since a foreign matter (coarse powder) removal valve 25 is installed in the self-circulation line, by opening and closing this valve intermittently, circulating products can be instantly pulled out of the pulverizer to ensure stable operation of the pulverizer. I can do it.

[Brief explanation of drawings]

Fig. 1 is a cutaway side view of essential parts of the pulverizer according to the present invention;
The figure is a cross-sectional view of Figure 1, and its proper half is
Figure 1 is a cross-sectional view taken along line X-X, Figure 3 is a rear view, and Figure 4 is an enlarged view of the foreign object removal valve 1) 1
It is an fI plane view. FIG. 5 is a diagram showing a rotary disk and a casing of a crusher in another embodiment, and FIG. 6 is a sectional view of the rotary disk. ]...Casing, 2...Supply port, 3...
...Outlet, 4...Crushing chamber, 5...
Classification chamber, 6...Circulation pipe, 8...Bag filter-19...Blower-1) 1... Rotating disk,
12.13...Impact column, 17...Blade, 19...Exhaust port, 20...Passway, 22.23...Auxiliary blade, 24...
・Secondary air inlet, 27...valve, 28...valve seat. Figure 5 Figure 6

Claims (4)

[Claims] (1) A centrifugal classifier is installed adjacent to the impact crusher, and the coarse powder outlet provided on the outer periphery of the classifier is connected to the material supply port of the crusher through a circulation pipe. A fine grinder featuring: (2) The above-mentioned impact type crushing device has a large number of impact columns planted on the outer periphery of the rotary disk, and a large number of impact columns installed on the inner surface of the casing surrounding the rotary disk, facing and intersecting with the above-mentioned impact columns. A pulverizer according to claim (1). (3) The above-mentioned centrifugal classification device consists of a classification blade fixed to a rotating shaft, a casing surrounding the classification blade, a circulation pipe opening in the casing, and a fine powder discharge port provided at the base of the classification blade. Claim (1) or (2)
). (4) The pulverizer according to claim (1), further comprising a foreign matter removal valve branched from the circulation pipe in the circulation pipe.